Final answer:
Ken exhibits delusions, hallucinations, disorganized speech, and negative symptoms, with the first three being positive manifestations of schizophrenia, adding abnormal experiences contrary to negative symptoms that involve loss of normal functions.
Step-by-step explanation:
The symptoms indicating that Ken is experiencing schizophrenia include: delusions, hallucinations, disorganized speech, and negative symptoms such as a flattened emotional state, loss of pleasure, and loss of basic drives. Among these symptoms, delusions, hallucinations, and disorganized speech are considered positive manifestations of schizophrenia. Positive symptoms are those that add behaviors or feelings that are not typically experienced by most people, such as false beliefs and seeing or hearing things that are not there. Negative symptoms, on the other hand, refer to a lack or decrease in abilities and behaviors that are usually present, such as reduced emotion or motivation.